The registration portal at my sons school shows past years course enrollment. And I was able to couple that with the degrees conferred to come up with the following information.
Some of the students that started first year studio could certainly have gone on to get a BS Arch or leveraged it into some other major but it gives some indication of how the cohort shrinks.
Fall 2016 - 58 students took first sem. studio - 20 Barch degrees were conferred in '21.
Fall 2017 - 51 students took first sem. studio - 18 Barch degrees were conferred in '22.
Fall 2018 - 55/23
Fall 2019 - 68/23